A method for designing cylindrical hollow superconducting shields for cryogenic measurement devices operating in background fields of 1 T is proposed. The shield design is based on MgB2 composite, manufactured by the reactive Mg liquid infiltration process [1]. The MgB2 composite allows low-cost shields with good mechanical resistance to be realized easily. The geometrical design is benchmarked by the experimental characterization at 4.2 K. A design case study for the shield of a cryogenic DC current transformer is reported. Design results show a shielding efficiency of 70% for both the axial and radial components, with prospective measurement accuracy up to 10 ppm on 100 kA.
MgB2 cylindrical superconducting shielding for cryogenic measurement applications: A case study on DC current transformers / Arpaia, Pasquale; Ballarino, Amalia; Giunchi, Giovanni; Montenero, Giuseppe. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - 9:(2014). [10.1088/1748-0221/9/04/P04020]
MgB2 cylindrical superconducting shielding for cryogenic measurement applications: A case study on DC current transformers
ARPAIA, PASQUALE;
2014
Abstract
A method for designing cylindrical hollow superconducting shields for cryogenic measurement devices operating in background fields of 1 T is proposed. The shield design is based on MgB2 composite, manufactured by the reactive Mg liquid infiltration process [1]. The MgB2 composite allows low-cost shields with good mechanical resistance to be realized easily. The geometrical design is benchmarked by the experimental characterization at 4.2 K. A design case study for the shield of a cryogenic DC current transformer is reported. Design results show a shielding efficiency of 70% for both the axial and radial components, with prospective measurement accuracy up to 10 ppm on 100 kA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
